CN110057754A - It is a kind of to divide aperture optical camera lens for underwater polarization imaging - Google Patents
It is a kind of to divide aperture optical camera lens for underwater polarization imaging Download PDFInfo
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- CN110057754A CN110057754A CN201910432927.5A CN201910432927A CN110057754A CN 110057754 A CN110057754 A CN 110057754A CN 201910432927 A CN201910432927 A CN 201910432927A CN 110057754 A CN110057754 A CN 110057754A
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- 230000010287 polarization Effects 0.000 title claims abstract description 65
- 230000003287 optical effect Effects 0.000 title claims abstract description 45
- 238000003384 imaging method Methods 0.000 title claims abstract description 33
- 239000005357 flat glass Substances 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims abstract description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 2
- 238000011897 real-time detection Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
- G01N2021/216—Polarisation-affecting properties using circular polarised light
Abstract
Divide aperture optical camera lens for underwater polarization imaging the present invention relates to a kind of, in the lens construction, polarizer group includes three linear polarization channels and a circular polarization channel, three linear polarization channels include one first linear polarizer and a plate glass, it is followed successively by the first linear polarizer peace glass sheet along optical path direction, the polarizing angle of 3 first linear polarizers is respectively 0 °, 60 ° and 120 °.Circular polarization channel includes one second linear polarizer and a quarter wave plate, is followed successively by the second linear polarizer and quarter wave plate along optical path direction.Three linear polarization channels and a circular polarization channel distinguish it is upper and lower, forward and backward deviate the optical axis of camera lens organized before aperture be altogether symmetrical arranged, it is respectively equipped with a sub-aperture lens group along respective optical path direction behind four channels, the common image planes position in four channels is arranged in detector.The present invention has the advantages that compact-sized, image acquisition speed is fast, small by external disturbance, and polarization precision is high.Present invention is particularly suitable for real-time detection sub-aqua sport or the objects of variation.
Description
Technical field
The invention belongs to underwater optics technical field of imaging, it is related to a kind of dividing aperture optical mirror for underwater polarization imaging
Head.
Background technique
Underwater Imaging is a meaningful job, since the surface that polarization image information can provide detection target is special
Therefore submarine target can be improved under mixed and disorderly background using underwater polarization imaging in the physical features such as property, masking and roughness
Discrimination can recognize that tradition underwater lens imaging technique is difficult to the target detected, increase image-forming range and investigation depth, improve
The contrast and clarity of image.
Currently, underwater polarized imaging system uses for reference remote sensing polarization imaging mostly, polarized using the timesharing of rotatory polarization chip
Imaging device obtains the polarization image of multi-angle, and then solves the polarization characteristic of target.Timesharing polarization imaging is troublesome in poeration, needs
Repeatedly be imaged, thus be more suitable for detection static scene, and disturb under water it is obvious (water has special optical characteristics,
Its refractive index is 1.33, and Abbe number 55.80 has perturbation, when carrying out Underwater Target Detection, due to water to the absorption of light and
Scattering leads to decaying of the light in aqueous medium propagation, and the contrast of object is low and smudgy when being imaged on the detector), point
When polarization imaging cannot really reflect the polarization characteristic of detected submarine target vulnerable to underwater disturbing influence, thus at image quality
It measures poor.
Summary of the invention
The present invention proposes a kind of compact-sized and can pass through single exposure while obtain three linear polarization images and circular polarization
Image divides aperture optical camera lens suitable for underwater polarization imaging, and Underwater Imaging quality is high.
The technical scheme adopted by the invention is as follows:
It is a kind of to divide aperture optical camera lens for underwater polarization imaging, including along optical path direction set gradually it is plate every
Camera lens, polarizer group, sub-aperture lens group and detector are organized before waterglass, total aperture；
The polarizer group includes three linear polarization channels and a circular polarization channel, and three linear polarization channels are equal
Including one first linear polarizer and a plate glass, first linear polarizer and the plate glass are followed successively by along optical path direction
Glass, the polarizing angle of 3 first linear polarizers are respectively 0 °, 60 ° and 120 °；The circular polarization channel includes one second linear polarizer
With a quarter wave plate, second linear polarizer and the quarter wave plate are followed successively by along optical path direction；
Before upper and lower, the forward and backward deviation aperture altogether is distinguished in three linear polarization channels and one circular polarization channel
The optical axis of group camera lens is symmetrical arranged, and is respectively equipped with a sub-aperture lens group, institute along respective optical path direction behind four channels
It states detector and the common image planes position in four channels is set.
Further, first linear polarizer, the plate glass, second linear polarizer and the quarter wave plate
Thickness be 1mm.
It is further, described that group camera lens is separation three-chip type lens group before aperture altogether, including coaxially successively arrange first
Lens, the second lens and the third lens；
The front surface radius of curvature of first lens is 43.28mm, and rear surface radius of curvature is 53.44mm, with a thickness of
8.19mm；Second lens are cemented doublet, and front surface radius of curvature is 23.32mm, and glued surfaces radius of curvature is
124.30mm, rear surface radius of curvature are 16.10mm, and preceding glued with a thickness of 10.96mm, rear gluing is with a thickness of 2.56mm；It is described
The third lens are cemented doublet, and front surface radius of curvature is -32.33mm, and glued surfaces radius of curvature is 41.68mm, rear table
Curvature radius is -76.08mm, and preceding glued with a thickness of 10.0mm, rear gluing is with a thickness of 10.0mm.
Further, the sub-aperture lens group is separation three-chip type lens group, and the including coaxially successively arranging the 4th is saturating
Mirror, the 5th lens and the 6th lens；
The front surface radius of curvature of 4th lens is 23.39mm, and rear surface radius of curvature is 11.77mm, with a thickness of
3.89mm；The front surface radius of curvature of 5th lens is 11.98mm, and rear surface radius of curvature is -37.82mm, with a thickness of
4.75mm；The front surface radius of curvature of 6th lens is -27.44mm, and rear surface radius of curvature is -123.86mm, thickness
For 4.24mm.
Further, the spectral response range of the detector is 430~656nm.
The beneficial effects of the present invention are:
Optical lens of the invention is compact-sized, and the structure of eccentric four channel of polarization is used to realize three linear polarization images
It is obtained while with a circular polarization image, i.e., circular polarization and the linear polarization figure for obtaining measured target is imaged by single exposure
The advantages that picture has image acquisition speed fast, small by external disturbance, and polarization precision is high.The circular polarization of acquisition and linear polarization image
Processing of the later period to polarization vector figure is facilitated, the Underwater Imaging of high quality can be obtained.Present invention is particularly suitable for real-time detections
Sub-aqua sport or the object of variation.
Detailed description of the invention
Fig. 1 is light path design figure (forward and backward two polarization for being divided to aperture optical camera lens for underwater polarization imaging of the invention
Channel is not shown)；
Fig. 2 is the point range figure for dividing aperture optical camera lens for underwater polarization imaging；
Fig. 3 is the encircled energy curve for dividing aperture optical camera lens for underwater polarization imaging；
Fig. 4 is the mesh distortion figure for dividing aperture optical camera lens for underwater polarization imaging；
Fig. 5 is the modulation transfer function curve for dividing aperture optical camera lens for underwater polarization imaging；
Appended drawing reference: the plate water-stop sheet of 1-, the first lens of 2-, the second lens of 3-, 4- the third lens, 5- polarizer
Group, the 4th lens of 6-, the 5th lens of 7-, the 6th lens of 8-, 9- detector, deg- field of view angle unit.
Specific embodiment
Divide aperture optical mirror for underwater polarization imaging to of the invention with specific embodiment with reference to the accompanying drawing
Head is described in further detail.
The index path of provided in this embodiment point of aperture optical camera lens as shown in Figure 1, the optical lens include along optical path
Plate water proof glass 1 that direction is set gradually organizes camera lens, polarizer group 5, sub-aperture lens group and detector before aperture altogether
9。
Polarizer group 5 includes three linear polarization channels and a circular polarization channel, and three linear polarization channels include one
First linear polarizer and a plate glass are followed successively by the first linear polarizer peace glass sheet, 3 first linear polarizations along optical path direction
The polarizing angle of piece is respectively 0 °, 60 ° and 120 °.Circular polarization channel includes one second linear polarizer and a quarter wave plate, along optical path side
To the second linear polarizer and quarter wave plate is followed successively by, the polarizing angle of the second linear polarizer is any angle.First linear polarizer is put down
The thickness of glass sheet, the second linear polarizer and quarter wave plate is 1mm, the first linear polarizer, the second linear polarizer and quarter wave plate
Material be H-K9.
The optical axis of group camera lens before the total aperture of upper and lower, forward and backward deviation is distinguished in three linear polarization channels and a circular polarization channel
It is symmetrical arranged, three the first linear polarizers and second linear polarizer are located at same perpendicular.Along respective behind four channels
Optical path direction be respectively equipped with a sub-aperture lens group, the common image planes position in four channels is arranged in detector 9, it is contemplated that water
To the absorption characteristic of different wave length, detector 9 chooses the ccd detector of 430~656nm of wavelength spectral range, having a size of
For the area array CCD of 14.1 × 11.3mm as receiver, single pixel is 10.8 μm.
Group camera lens is separation three-chip type lens group before aperture altogether, including the first lens 2, the second lens coaxially successively arranged
3 and the third lens 4.In the present embodiment, the front surface radius of curvature of the first lens 2 is 43.28mm, and rear surface radius of curvature is
53.44mm, with a thickness of 8.19mm, material H-LAK59.Second lens 3 are cemented doublet, and front surface radius of curvature is
23.32mm, glued surfaces radius of curvature are 124.30mm, and rear surface radius of curvature is 16.10mm, it is preceding it is glued with a thickness of
10.96mm, rear glued with a thickness of 2.56mm, preceding glueing material is H-ZPK, and rear glueing material is F4.The third lens 4 are double glued
Lens, front surface radius of curvature be -32.33mm, glued surfaces radius of curvature be 41.68mm, rear surface radius of curvature be -
76.08mm, preceding glued with a thickness of 10.0mm, rear glued with a thickness of 10.0mm, preceding glueing material is D-LAK70, rear glueing material
For H-ZBAF21.
Sub-aperture lens group is separation three-chip type lens group, including the 4th lens 6, the 5th lens 7 coaxially successively arranged
With the 6th lens 8.In the present embodiment, the front surface radius of curvature of the 4th lens 6 is 23.39mm, and rear surface radius of curvature is
11.77mm, with a thickness of 3.89mm, material H-ZF52.The front surface radius of curvature of 5th lens 7 is 11.98mm, and rear surface is bent
Rate radius is -37.82mm, with a thickness of 4.75mm, material H-ZLAF50.The front surface radius of curvature of 6th lens 8 be-
27.44mm, rear surface radius of curvature is -123.86mm, with a thickness of 4.24mm, material H-F13.
In addition, plate water proof window 1 with a thickness of 8.0mm, material H-K9.
Underwater polarization imaging divides aperture optical camera lens when carrying out Underwater Imaging, and the reflected light of detected target successively passes through
Camera lens, polarizer group 5, sub-aperture lens group are organized before crossing plate water proof window 1, altogether aperture, is finally imaged on detector 9.
The service band of camera lens of the invention is 470~656nm, and the effective focal length of camera lens is 40mm, and F-number F is 4, lens system view
Rink corner ± 5 °.
Since pixel single on ccd detector is 10.8 μm, then CCD Nyquist frequency can be calculated by single Pixel size
Rate
As each visual field point range figure of plane, the geometry disc of confusion under each visual field is respectively less than to be imaged ray tracing according to fig. 2
10.8 μm of the single pixel of detector, meets imaging requirements.
According to the encircled energy curve of the optical lens of Fig. 3, as can be seen from Figure, this optical lens is in each visual field
Under, the imaging beam encircled energy in single detector pixel is 90%.
According to the mesh distortion figure of the optical lens of Fig. 4, meet imaging requirements.
According to the modulation transfer function curve of optical lens in Fig. 5, at nyquist frequency 46lp/mm, system is all
The mtf value of visual field is all not less than 0.8, and close to diffraction limit, image quality is good.
Technical solution provided herein is described in detail above, specific case used herein is to this Shen
Principle and embodiment please is expounded, the present processes that the above embodiments are only used to help understand and its
Core concept；At the same time, for those skilled in the art, according to the thought of the application, in specific embodiment and application
There will be changes in range, in conclusion the contents of this specification should not be construed as limiting the present application.
Claims (5)
1. a kind of divide aperture optical camera lens for underwater polarization imaging, which is characterized in that including being set gradually along optical path direction
Plate water proof glass (1), camera lens, polarizer group (5), sub-aperture lens group and detector (9) are organized before aperture altogether；
Polarizer group (5) includes three linear polarization channels and a circular polarization channel, and three linear polarization channels include
One first linear polarizer and a plate glass are followed successively by first linear polarizer and the plate glass along optical path direction, and three
The polarizing angle of first linear polarizer is respectively 0 °, 60 ° and 120 °；The circular polarization channel includes one second linear polarizer and 1
4 wave plates are followed successively by second linear polarizer and the quarter wave plate along optical path direction；
Mirror is organized before distinguishing upper and lower, the forward and backward deviation aperture altogether in three linear polarization channels and one circular polarization channel
The optical axis of head is symmetrical arranged, and is respectively equipped with a sub-aperture lens group, detector along respective optical path direction behind four channels
(9) the common image planes position in four channels is set.
2. according to claim 1 divide aperture optical camera lens for underwater polarization imaging, which is characterized in that described first
Linear polarizer, the plate glass, second linear polarizer and the quarter wave plate thickness be 1mm.
3. according to claim 1 or 2 divide aperture optical camera lens for underwater polarization imaging, which is characterized in that described
Group camera lens is separation three-chip type lens group before aperture altogether, including coaxially successively arrange the first lens (2), the second lens (3) and
The third lens (4)；
The front surface radius of curvature of first lens (2) is 43.28mm, and rear surface radius of curvature is 53.44mm, with a thickness of
8.19mm；Second lens (3) are cemented doublet, and front surface radius of curvature is 23.32mm, and glued surfaces radius of curvature is
124.30mm, rear surface radius of curvature are 16.10mm, and preceding glued with a thickness of 10.96mm, rear gluing is with a thickness of 2.56mm；Third
Lens (4) are cemented doublet, and front surface radius of curvature is -32.33mm, and glued surfaces radius of curvature is 41.68mm, rear surface
Radius of curvature is -76.08mm, and preceding glued with a thickness of 10.0mm, rear gluing is with a thickness of 10.0mm.
4. according to claim 3 divide aperture optical camera lens for underwater polarization imaging, which is characterized in that the sub-aperture
Diameter lens group is separation three-chip type lens group, including the 4th lens (6), the 5th lens (7) and the 6th saturating coaxially successively arranged
Mirror (8)；
The front surface radius of curvature of 4th lens (6) is 23.39mm, and rear surface radius of curvature is 11.77mm, with a thickness of
3.89mm；The front surface radius of curvature of 5th lens (7) is 11.98mm, and rear surface radius of curvature is -37.82mm, with a thickness of
4.75mm；The front surface radius of curvature of 6th lens (8) is -27.44mm, and rear surface radius of curvature is -123.86mm, with a thickness of
4.24mm。
5. according to claim 1 divide aperture optical camera lens for underwater polarization imaging, which is characterized in that detector
(9) spectral response range is 430~656nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432927.5A CN110057754B (en) | 2019-05-23 | Sub-aperture optical lens for underwater polarization imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432927.5A CN110057754B (en) | 2019-05-23 | Sub-aperture optical lens for underwater polarization imaging |
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| Publication Number | Publication Date |
|---|---|
| CN110057754A true CN110057754A (en) | 2019-07-26 |
| CN110057754B CN110057754B (en) | 2024-04-19 |
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